function RBounds(leftbottom,righttop){
	this.leftbottom=leftbottom;
	this.righttop=righttop;
	this.startLat=leftbottom.lat;
	this.startLng=leftbottom.lng;
	this.endLat=righttop.lat;
	this.endLng=righttop.lng;
	
	this.toString=function(){
		return 'RBounds';
	}
}